Diagnostic Mode F8 stuck at C8

I've worked on Maytags before, and there are a couple of things that I would try. First, see if anything is clogging or pinching the drain hose I've seen it before. Now seeing how you replace the pump and calibrated the water level sensor already I would start looking at manually opening the water valve and doing a recirculation test which also test the water pump to ensure its doing its job properly. Hopefully, it's just the hose. If not, the last test will tell you if the water pump is doing its job. Best of luck!